Granted Patent
Utility
US 4,437,779 · App. 06/335,479
Replaceable ribbon cartridge
Inventors:
Willie Goff, Jr., William M. Jenkins
Patented Case
View Patent ↗
Granted: Mar 20, 1984
Filed: Dec 29, 1981
Inventors
Willie Goff, Jr.
William M. Jenkins
Assignee (at issue)
International Business Machines Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.